mpd service or Who wants to live forever...

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rpi

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Joined 2015
#1
How can I stop/disable mpd service at startup?

I tried to stop/disable mpd as a system service:
Code: 
sudo service mpd stop
sudo update-rc.d mpd disable
sudo systemctl disable mpd.socket
sudo systemctl disable mpd.service
It didn't help. Also I tried this proposal:
systemd - Prevent mpd finally from auto-starting - Ask Ubuntu
It didn't work either. Whenever I start RPi I always see mpd process running:
Code: 
pi@raspberrypi:~ $ ps -elf | grep mpd
0 S pi         631   556  0  80   0 - 49135 do_epo 03:56 ?        00:00:01 /usr/bin/mpd --no-daemon
What else should be changed to avoid mpd running as a service at startup?
Thanks!
 
#4
If your raspbian does not use systemd (I do not know), you can always grep the /etc dir and find the occurence.

Code: 
sudo rgrep mpd /etc

From that list you can easily find out why the service gets started.

If your system has update-rc, you can just delete the symlinks in corresponding level dirs. Or use

Code: 
sudo update-rc.d -f remove mpd

- see man update-rc.d for difference

But I wonder why mpd is running under pi user, normally it has a dedicated mpd user. Are you sure you do not have some custom scripts on your system?
 
#5
I'm trying to make 'mpd' working under 'pi' user. Here are the steps:
Code: 
sudo apt-get install mpd
sudo service mpd stop
sudo update-rc.d mpd disable
sudo systemctl disable mpd
sudo systemctl disable mpd.socket
sudo systemctl disable mpd.service
It installs 'mpd' and stops it as a system service. After reboot I don't see 'mpd' process.

Then I switch to the 'pi' user:
Code: 
sudo chown pi /usr/bin/mpd
sudo chgrp audio /usr/bin/mpd
mkdir /home/pi/.config
mkdir /home/pi/.config/mpd
mkdir /home/pi/.config/mpd/playlists
Then I make mpd.conf file where all links point to ~/.config/mpd folder, change user 'mpd' to 'pi' and place the file in ~/.config/mpd
After that 'mpd' always starts during booting.
Code: 
pi@raspberrypi:~ $ sudo rgrep mpd /etc
Binary file /etc/ld.so.cache matches
/etc/shadow:mpd:*:18133:0:99999:7:::
/etc/ssl/certs/ca-certificates.crt:374jNUUeAlz+taibmSXaXvMiwzn15Cou08YfxGyqxRxqAQVKL9LFwag0Jl1mpdIC
/etc/default/mpd:## Defaults for the MPD init script, sourced by /etc/init.d/mpd on Debian
/etc/default/mpd:## command 'update-rc.d mpd disable' (or 'systemctl disable mpd' for systemd).
/etc/default/mpd:## The configuration file location for mpd:
/etc/default/mpd:# MPDCONF=/etc/mpd.conf
/etc/logrotate.d/mpd:/var/log/mpd/*.log {
/etc/passwd-:mpd:x:109:29::/var/lib/mpd:/usr/sbin/nologin
/etc/shadow-:mpd:*:18133:0:99999:7:::
/etc/init.d/mpd:# Provides:          mpd
/etc/init.d/mpd:NAME=mpd
/etc/init.d/mpd:DAEMON=/usr/bin/mpd
/etc/init.d/mpd:MPDCONF=/etc/mpd.conf
/etc/init.d/mpd:mpd_start () {
/etc/init.d/mpd:        if dpkg-statoverride --list --quiet /run/mpd > /dev/null; then
/etc/init.d/mpd:            dpkg-statoverride --force --quiet --update --add $( dpkg-statoverride --list --quiet /run/mpd ) 2> /dev/null
/etc/init.d/mpd:            chown mpd:audio $PIDDIR
/etc/init.d/mpd:mpd_stop () {
/etc/init.d/mpd:# /etc/init.d/mpd when mpd is updated
/etc/init.d/mpd:        mpd_start
/etc/init.d/mpd:        mpd_stop
/etc/init.d/mpd:        mpd_stop
/etc/init.d/mpd:        mpd_start
/etc/init.d/mpd:        mpd_start
/etc/init.d/mpd:        mpd_stop
/etc/init.d/mpd:        mpd_start
/etc/init.d/mpd:        mpd_stop
/etc/init.d/mpd:        mpd_start
/etc/xdg/autostart/mpd.desktop:# Make sure to create your own ~/.mpdconf containing the path to your music,
/etc/xdg/autostart/mpd.desktop:Exec=mpd
/etc/passwd:mpd:x:109:29::/var/lib/mpd:/usr/sbin/nologin
 
#6
Code: 
/etc/xdg/autostart/mpd.desktop:# Make sure to create your own ~/.mpdconf containing the path to your music,
/etc/xdg/autostart/mpd.desktop:Exec=mpd

You have mpd in autostart - MPD is started when user logs in into desktop environment XDG Autostart - ArchWiki . Very likely configured by the MPD package . To confirm search the file in packages with


Code: 
dpkg -S mpd.desktop
 
#7
That's because I'm trying to do that from scratch and didn't complete yet the steps described in the link which I mentioned already: systemd - Prevent mpd finally from auto-starting - Ask Ubuntu

But even if I follow all those instructions 'mpd' is still running. Even if I remove completely that file /etc/xdg/autostart/mpd.desktop it's still running and also:
Code: 
pi@raspberrypi:~ $ dpkg -S mpd.desktop
mpd: /etc/xdg/autostart/mpd.desktop
 
#8
Yeah, the xdg entry is provided directly by the mpd package, it was expectable.

I would delete the autostart entry completely, instead of copying it to user-level xdg config and hoping some config directive is honoured. I do not see any reason why mpd should autostart (of course upon reboot), if there is no config anymore.
 
#9
Yes, it looks weird (after removing config file and rebooting):
Code: 
pi@raspberrypi:~ $ ls /etc/xdg/autostart/
xdg-user-dirs.desktop
pi@raspberrypi:~ $ ls .config
mpd
pi@raspberrypi:~ $ dpkg -S mpd.desktop
mpd: /etc/xdg/autostart/mpd.desktop
pi@raspberrypi:~ $ ps -elf | grep mpd
0 S pi         665   653  2  80   0 - 46832 do_epo 18:28 ?        00:00:01 /usr/bin/mpd --no-daemon
 
#10
Are you sure you have no user xdg entry for mpd autostart?

I would disable user autologin to desktop environment (if enabled). When the login screen appears after reboot, I would switch to console (Ctrl+Alt+F1), log in and check if mpd is running. If so, it is started by some startup script (systemd, update-rc.d). If not, get back to X Window (Alt+F7 or F8), log into desktop environment. If mpd is running, it is started by xdg autostart, you must have it somewhere in the scripts (~/.config/autostart/* ?).
 
#13
Somehow it was started for 'pi' user. No idea how. And the most frustrating thing - I didn't configure anything for that.
Code: 
pi@raspberrypi:~ $ grep mpd /etc/rc.local
pi@raspberrypi:~ $ grep mpd .bashrc
pi@raspberrypi:~ $ systemctl list-unit-files | grep mpd
mpd.service                            disabled
mpd.socket                             disabled
pi@raspberrypi:~ $ ls /etc/init.d | grep mpd
pi@raspberrypi:~ $ ps -elf | grep mpd
0 S pi         702   690  0  80   0 - 46832 do_epo 19:29 ?        00:00:01 /usr/bin/mpd --no-daemon
 
#15
Code: 
pi@raspberrypi:~ $ rgrep mpd /home/pi
/home/pi/.config/mpd/mpd.conf:# or /usr/share/doc/mpd/user-manual.html
/home/pi/.config/mpd/mpd.conf:playlist_directory                "~/.config/mpd/playlists"
/home/pi/.config/mpd/mpd.conf:db_file                   "~/.config/mpd/tag_cache"
/home/pi/.config/mpd/mpd.conf:#log_file                 "/var/log/mpd/mpd.log"
/home/pi/.config/mpd/mpd.conf:# for use of mpd --kill and some init scripts. This setting is disabled by
/home/pi/.config/mpd/mpd.conf:pid_file                  "~/.config/mpd/pid"
/home/pi/.config/mpd/mpd.conf:state_file                        "~/.config/mpd/state"
/home/pi/.config/mpd/mpd.conf:sticker_file                   "~/.config/mpd/sticker.sql"
/home/pi/.config/mpd/mpd.conf:# to have mpd listen on every address. Not effective if systemd socket
/home/pi/.config/mpd/mpd.conf:#bind_to_address          "/run/mpd/socket"
/home/pi/.config/mpd/mpd.conf:# found in the mpd.conf man page.
/home/pi/.config/mpd/mpd.conf:#       host "other.mpd.host"
/home/pi/.config/mpd/mpd.conf:# mount           "/mpd.ogg"
/home/pi/.config/mpd/mpd.conf:#       path            "/var/lib/mpd/recorder/mpd.ogg"
/home/pi/.config/mpd/mpd.conf:# Please see README.Debian if you want mpd to play through the pulseaudio
/home/pi/.config/mpd/mpd.conf:# mpd.conf man page or the libsamplerate documentation. By default, this is
/home/pi/.config/mpd/state:mixrampdb: 0.000000
/home/pi/.config/mpd/state:mixrampdelay: -1.000000
Code: 
pi@raspberrypi:~ $ pstree -G
systemd─┬─agetty
        ├─alsactl
        ├─avahi-daemon───avahi-daemon
        ├─bluetoothd
        ├─cron
        ├─dbus-daemon
        ├─dhcpcd
        ├─hciattach
        ├─lircd───sh
        ├─rngd───3*[{rngd}]
        ├─rsyslogd───3*[{rsyslogd}]
        ├─sshd───sshd───sshd───bash───pstree
        ├─systemd─┬─(sd-pam)
        │         └─mpd───2*[{mpd}]
        ├─systemd-journal
        ├─systemd-logind
        ├─systemd-timesyn───{systemd-timesyn}
        ├─systemd-udevd
        ├─thd
        └─2*[wpa_supplicant]
 
#16
Interesting. mpd is not started directly by systemd like all other units (cron, lircd, etc.), but by another systemd process which started sd-pam too. PAM is login service. You said you have configured autologin to console. My 2 cents mpd is somehow configured as user-session systemd service systemd/User - ArchWiki

What is in your /usr/lib/systemd/user/? Perhaps the mpd package installed some service there too? Is any listed in dpkg -L mpd?

Look at systemd/User - ArchWiki - note the --user parameter of systemctl . It may be possible you have disabled global mpd, but your user-level mpd is enabled.
 
#17
Yes, there was mpd.service in folder /usr/lib/systemd/user. Removing that file fixed the problem. Probably there is a command which should do that in a "graceful" way. I'm pretty sure I didn't configure user level service for 'mpd'. More likely 'mpd' itself does that.

Anyway, thanks a lot!
 
#19
Yes, it's there:
Code: 
pi@raspberrypi:~ $ dpkg -L mpd
/.
/etc
/etc/default
/etc/default/mpd
/etc/init.d
/etc/init.d/mpd
/etc/logrotate.d
/etc/logrotate.d/mpd
/etc/mpd.conf
/etc/xdg
/etc/xdg/autostart
/etc/xdg/autostart/mpd.desktop
/lib
/lib/systemd
/lib/systemd/system
/lib/systemd/system/mpd.service
/lib/systemd/system/mpd.socket
/usr
/usr/bin
/usr/bin/mpd
/usr/lib
/usr/lib/systemd
/usr/lib/systemd/user
/usr/lib/systemd/user/mpd.service
...
 
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